Ryuga Dogai regresa para investigar un nuevo misterio: el robo de Makai Knights Armor. Entre las víctimas se encuentran los viejos camaradas de Ryuga de la crisis de Volcity, Takeru y Aguri. Los tres se enfrentarán a un enemigo previamente derrotado: Zinga.
Tokyo Family Court judicial research official Akira Yamanobo is in charge of Tetsuo and Ayano Katase's divorce arbitration. Ayano, the wife, who works for a boutique company, insists her husband is involved with another woman. Supported by her employer Kotomi Saegusa, the company president, she demands a divorce as soon as possible. On the other hand, her husband Tetsuo, a trading professional, denies having a relationship with a woman. He says he will not agree to the divorce and does not plan to let his only son Kenta go, so the arbitration continues. According to Akira's investigation, Ayano gave birth to Kenta as a single mother five years ago when she was working as a hospital clerk, making him Tetsuo's stepson. Tetsuo loves Kenta as his own child, so Akira doesn't understand why Ayano is so insistent on getting a divorce. However, Tetsuo's insistence on not giving up custody of his stepson Kenta is also very unusual.
Un incidente relacionado con el bioterrorismo ocurre en una universidad de Australia Occidental. Chris y Piers de la unidad antiterrorismo BSAA's se dirigen a la escena a investigar y cooperar con Rebecca, ex miembro de S.T.A.R.S. quien es profesora en la universidad. En el sitio, conocen a un misterioso hombre llamado Tyler Howard…
Después de salvar con éxito a Ryume y detener a Agō, Ryuga y Rian se asignan en virtud de ella como guardianes de Line City, que investiga un misterioso aumento de la actividad de Horrores en la zona.
